Methods and apparatus relate to recovery of carbon dioxide andor hydrogen sulfide from a gas mixture. The apparatus allows classification of objects composed of one of a wide range of materials and also provides for discrimination of objects comprising different grades of the same material. Upon accessing the chemical design and query tool by a user, the user interface guides the user in selecting a chemical design structure, and submitting the chemical design structure to a provider system. The process requires that the user make a selection for each of the parameters so a validation step can occur ensuring the desired product can be manufactured and an accurate labor charge or quote can be provided. Thus, an increase in number of parts can be avoided in the lubrication of the slide portions of at least some rocker arms.